生龙活虎[shēng lóng huó hǔ] 基本解释：

full of vigor and vitality

新英汉大词典：

生龙活虎  [shēng lóng huó hǔ]

• • - a lively dragon and an active tiger; brimming with energy; doughty as a dragon and lively as a tiger -- full of vim and vigour; (like) full-spirited tigers; full of life and energy; full of vigour [vim] and vitality; having a strong and lively spirit; (to jump) like a young tiger; robust and lively; with life and vigour; working hard and happily:

    • The lads work with furious energy.

      小伙子干起活来真是生龙活虎。